How to use Sync Clips To Marker

If you're talking about the built-in function, I honestly don't fully recall what it does.

You can take a look at this script instead perhaps:

function processBatch(markerStart, markerEnd) {
    var nextMarker = markerStart;

    function processClip() {
        sf.ui.proTools.getMenuItem('Edit', 'Copy').elementClick();
        sf.ui.proTools.memoryLocationsGoto({ memoryLocationNumber: nextMarker });
        sf.ui.proTools.getMenuItem('Edit', 'Paste').elementClick();

        nextMarker++;
        if (nextMarker > markerEnd) throw 'DONE';
    }

    sf.ui.proTools.clipDoForEachSelectedClip({
        action: processClip
    });

    return nextMarker;
}

function main() {
    var markerStart = Number(prompt('Start by marker?'));
    var markerEnd = Number(prompt('End by marker?'));
    var nextMarker = markerStart;

    try {
        while (nextMarker <= markerEnd) {
            nextMarker = processBatch(nextMarker, markerEnd);
        }
    } catch (err) {
        if (err + '' === 'DONE') return;
        throw err;
    }
}

main();

You should start with a selection of a number of clips.
When you run the script, it will ask you for the number of the first marker and the last marker you want to process.

The script will now loop through each of your originally selected clips and paste them at each of the markers.

I'm just replying here to remind me to come back to @Owen_Granich_Young's package, as this looks ideal for dropping pickups for audiobooks from what I can read, just don't have time to look now!